Refillable fuse-cartridge.



G. W APPLER EEFILLABLE FUSE CARTRIDGE.

APPLICATION FILED MAY s, 1913.

l 1,093,164-, Patented Apr.14, 1914.

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W /N VENTO/e WJTNE ES: v WQ 'c i TURA/EY.

UNrrED sra'rn GRAFTON w. ArrLER,

PATENT OFFICE.

0F LYONS, NEW YORK.

REFILLABLE FUSE-CARTRIDGE.

Cartridges, of which the following. taken in connection with the'accompanying drawings,

is a full, clear, and exact description.

This inventionrelates to certain improvements in reillable fuse cartridges of the class set forth in my Patent No. 1,052,202, issued February 4, 1913, except that the primary object of my present invention is to provide for the use of a multiple fuse or fuses either laminated vor' arranged in such close juxtaposition as to dissipate to an appreciable extent the force of an explosion due to the thermal disintegration.

I have found that, in the use of the ordinary single fuse cartridge in connection with light and power distributing systems and other comparatively high voltage circuits,

- the force of explosion resulting from sudden thermal disintegration of the fuse is frequently sufficient to disintegrate or impair the cartridge beyond further use, thereby negativing .the advantages of a rellable cartridge by necessitating its replacement by a new one. I have also discovered that when a fuse of the desired current-carrying capacity is made up of a multiplicity of parts either laminated or in multiple, the force of explosion incidental to the disintegration of any one of the parts by heat is materially reduced or dissipated through the entire series of fuses. This is due to the fact that the fuse units disintegrate in succession, which although rapid is sufficiently retarded or prolonged to cause the 'dissipation of such f' force and thereby reduces the liability of injuring the cartridge.

The primary object, therefore, 1s to not I only provide a refillable cartridge with a multiple fuse or a plurality of fuses connected in multiple. but also to provide simple means for replacing and securing these fuses in operative position within the cartridge. Other objects and uses will be brought out in tho following description.

ln the drawings :--Figure l is a longitudinal sectional view of a reiillable cart-ridge having knife contactsand a multiplicityof fuses therein. Fig. 2 is a longitudinales@ tional view through one end of the same car tridge taken at right angles to that shown in Fig. 1. Fig. 3 is a transverse sectional Speccation of Letters Patent.

Application filed May 6,

Patented Apr. 14, 1914.

1913. serial No. 765,789.

g view through one end of the same cartridge showing more particularly the fastening means for one end of the fuses. Figs. l-.

'and 6 are perspective viewsrespectively 'of one of the end caps, the adjacent end of the ferrule and the corresponding end of the insulating tube. i.Figs 7 and 8 are longitudinal sectional views of one end of a modiied forni of cartridge taken at right angles to each other, omitting the knife-contacts and showing peripheral contact caps.

'This cartridgecomprises a tubular shell sulating tube 1- and are held in place by crimping their inner ends iinwardly into corresponding grooves in the tube 1--, thereby holding the ferrules against relative endwise movement or displacement.

The caps -3- are fitted with a snug slid? ing it over and upon the ferrules and are frictionallyheld in operative position by spring tongues -5-' on their inner ends, said tongues being preferably provided with indentations -6' projecting inwardly and adapted to enter corresponding depressions -7- in the periphery of the ferrule for ad ditionally holding the caps' on the ferrules by friction and, at the same timelypermitting said caps to be removed by hand when necessary in placing or replacing the fuses in operative position.

A plurality of fuses -aare arranged within and lengthwise of the tube 1- and are-.connected'in multiple to. the inner ends of suitable knife contact blades -SM'which are also inserted within the opposite ends of the tube, as shown more clearly in Figs. l, 2 and 3, the ends of the fuses being pret erably hook-shape and secured to their respective knife contacts by clamping devices 9- so as to establish electrical connection between the fuses and contacts. These fuses ma;v be made of ordinary round or lat fuse wire, but are preferably Hat and laminated to further reduce the force of e.\- plosion by dissipation and distribution from one lamina to another.

4The knife blades -S preferably consist of separate lat copper bars rectangu- -1- of vulcanized fiber or equivalentl insuand upon the corresponding ends .of the insie lar in plan and of substantially the same width as the external diameter of the tube, which latter is provided with diametrically opposite lengthwise slots *10- extending inwardly from the ends thereof and of substantially the same circumferential width as the thickness of the knife blades for re.-

ceiving the inner ends of said blades and thereby holding them against relative rotation on the ends of the tube. the slots and, therefore, the blades being disposed in the saine diametric plane so that the knife blades are supported centrally on the ends of the tubes and in the same fiat plane with their edges substantially coincident with the periphery of the adjacent portions of the tube, i

Theferrules --2f-- which, as previously stated, are'tted upon the ends of the tube and, as shown more clearly in Figs. 2 and 3,

surround the inner ends or edges of the knife blade `8,- and are firmly secured thereto by indenting portions of the periphery of the ferrule into'corresponding depressions in the adjacent 'edges of the blades, therebyT firmly holding the 4blades against relative endwise movement although it is evident that any other suitable fastening means'may be employed.

As previously stated, the caps -3- are fitted over and upon the ferrules *i2- and frictionally held in. operative position by the tongues *5- and depressions -6-, the outer ends of said caps being closed by end Walls as hllrhaving diametrical slots -12- of' substantially the same size and form as the cross sectional area of the knife blades -8- y which extend outwardly through said slots a sutcient distance to contact with the spring terminals (not shown) of any circuit in which the fuse cartridge is abdapted to be connected.

The fuse clamps -9- are preferably located near the outer ends of the tube and in close proximity to the outer ends of the caps -3- and in order that they may be accessible ,tor manipulation by ascrew driver or equivalent tool when the caps -3- are removed, as for instance in vremoving disintegrated fuses and replacing them with new ones, the outer ends of the tube -land ferrules -2- are provided with diametrically opposite recesses -l2 extending inwardly from their end faces and alined diametrically with the opposite ends of their corresponding clamps -9`.. These clamps are passed through apertures 13 in the blades 8 just inside of the outer ends of the caps *3-d and each preferably consists of an internally threaded bushing --ll and a screw -15--, the busliings -'liand screws -5- being provided with slotted heads at opposite sides of their corresponding knife blades t3- so as te secure the ends of the fuses -ato` j opposite sides of said blades in the manner li shown more clearly in Fig. 1. j In Figs. 7 and 8, I have shown a reiillable fuse cartridge similar to that shown in Figs. l l, 2 and 3 except that it is adapted for peripheral contact and for this purpose is provided with a relatively short fuse supporting blade -8- terminating at the end of the tube -lj *3* which is screwed or otherwise secured upon the periphery of an externally threadi ed ferrule 2-, s'aid ferrule being in close electrical connection with the blade -8- by reason of its contact with the edges thereof in the manner shown in Figi 2 so that i when the caps 3- are placed in operative position upon the fer-rules, close electrical connection is established between the caps and fuses, it being understood thatthe outer end walls of the ferrules -3- are imperforated or unprovided with slots 12- so as to completely close the adjacent open ends of the tube.

of any suitable powdered or common insulating substance, such as powdered chalk or similar material which will resist as far as possible attraction or attention.

lVhat l claim is:

l. A fuse cartridge comprising an insulating tube, flat conductor blades secured diametrically in the ends of the tubes in the vsame flat plane, a fuse, and separate devices on said blades for clamping the ends'of the fuse thereto, said insulatinur tube having lan openine through the periphery thereof alined with the fuse-clamping devices for the reception of a tool by which the clamping device may be operated.

2. A reillable fuse cartridge comprising an insulating tube, conductor blades secured diametrically within the tube in the same flat plane, a fuse, separate clamping devices for securing the ends of the fuse to the blades, and metal ferrules secured to the ends of the tube and electrically connected to their corresponding blades, said ferrules being provided with radial openings alined with the adjacent clamping device.

3. A relillable fuse cartridge comprising an insulating tube, conductor blades secured diametrically within the tube in the samc flat plane, a fuse, separate clamping devices for securing the ends of the fuse to the blades, and metal fer-rules secured to the t ends of the tube and electrically connected j to their corresponding blades, said ferrules being provided with radial openings alined j with the adjacent ,clamping device, and l 1 l metal caps closing the open ends of the tube. fi. ii reiillable fuse cartridge comprising an insulating tube, flat conducting plates secured diainetrically in opposite ends of the tube, a plurality of fuses secured to4 opposite sides of said plates, separate clamping and covered by a contact cap In Fig. 3, I have shown the usual filling devices for theends of the fuse, ferrules secured to the ends of the tube in electrical contact with the adjacent plates, and metal caps slidably fitted upon the ferrules and closing the open ends of the tube.

5. A rellable fuse cartridge comprising an insulating tube having lengthwise slots in its opposite endsconduetor blades' projectvends o #said tube and having their" edges seated iii ltlie'adjacent slots, a fuse connectjing said blades and ferrules inclosing the slotted' ends' of the tube and electrically connected to the'blades through the slots.

7. Afrellable fuse cartridge comprising an insulating tube having slotted ends, conductor blades seated in the slots in said ends lto hold them against turning, metal ferrules surroundin the slot-ted ends of the tubes and contactlng with the edges of the blades, and fuses havmg their ends attached to opposite faces of adjacent blades. V.

8. A rellable fuse'cartridge comprising an insulating tube, conductor blades Secured against turning in opposite ,ends of the tube and provided with screw holes, Vseparate fuses extending along opposite faces of the blades, and fuse clamps composed of screw members 'screwing one into the other through the screw-holes and engaging the adjacent ends of the fuses. l

In witness whereof I have hereunto set my hand this 22nd day ofAprl, 1913.-

GRAFTON w. PPLER. Witnesses:

Il. E. Omen, Eva E. GREENIEAF.

2lil

I Copies of thispatent may be obtained for ve cents each, by addressing the Commissioner of Patents, i

Washington, n. ci? 

